Investigate archaeologists' activities? (3)

I believe the answer is:

dig

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'investigate' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dig that I've seen before include "Briefly, an archaeological excavation" , "Burrow" , "Cutting remark" , "Maybe break new ground" , "Jibe" .)

I've seen this clue in the Evening Standard.

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